ART. 2. PETROLOGY AT GOOSE CREEK — SHANNON. 5 



5. Aplitic albite rocks — Continued. 



d. Minerals. 



(1) Quartz. 



(2) Feldspars. 



(3) Diopside. 



(4) Epidote. 



(5) Alteration products. 



e. Discussion, Origin. 



6. Miarolitic cavities. 



a. Occurrence, size. 

 h. Original minerals. 



(1) Quartz. 



(2) Albite. 



(3) Diopside. 



(4) Titanite. 



c. Second generation minerals. 



(1) Plornblende (byssolitic) . 



(2) Chalcopyrite. 



(3) Epidote. 



(4) Chlorite. 



d. Discussion of origin. 



7. Hydrothermal alteration along seams and fissures. 



a. Diopside-filled cracks accompanied by diopsidization of the 



adjacent diabase. 

 6. Chlorite seams accompanied by hornblendization of the 



normal rock. 



c. Hornblende-filled cracks without alteration of the adjacent 



diabase. 



d. Bluish hornblende coatings on fracture surfaces. 



e. Alteration of normal diabase adjacent to zeolite-bearing 



veins. 



/. "Diabantite varnish" on slickensided Joints. 



g. Alteration of diabase pegmatite where intersected by diop- 

 side seams. 



li. Hornblendization of normal diabase pegmatite along cracks 

 and seams. 



i. Hornblendization of diopside of albite-diopside pegmatite 

 rocks. 



8. Hydrothermal joint and cavity fillings. 



a. Occurrence. 

 6. Minerals. 



(1) Albite. 



(2) Chlorites. 



(3) Hornblende (byssolitic). 



(4) Epidote. 



